I would not worry. You have a type of cavendish banana similar to the store bought variety Grand Naine. Grand Naine means giant dwarf, while yours is the dwarf giant. I believe it gets a little taller than a GN (about 8-10' I believe) and is a dwarf version of the giant cavendish. Don't hold me to this I'm new to this too and these type of names always rattle me a little bit, but I know several members here are growing this one so you should be able to find more info here if you want. I would separate the plants because 1) You will have 3x as many plants, 2) Its much easier to separate pups when you have the whole root ball out of the container/ground, and 3) You will have less competition for water and nutrients and your plants will grow much faster if treated as 3 separate plants rather than one. Here is my experience with the situation with an unknown cavendish (probably GN or EG) that I bought for cheap which had 2 pups on the small plant already. Since I bought it just to add some ornamental appeal and fill some space in one of the tropical gardens, I left it all together to hopefully form a few nice tall stems by the end of the year. However the plants just never really seemed to grow all summer no matter what I did. So when I dug them up in the fall, I separated the 3 plants, potted them up separately, and tucked the small little "mother" plant under my growlights. Well that mother plant has tripled in size easily over the winter unexpectedly, I don't try push a lot of growth in winter even under my lights, the light is just to baby some key plants. When I separated the 3 plants I found the corms were kind of smooshed together and were growing around each other because of the limited space in the container when they were young. Separating the plants allowed the corms to fill out properly which then led to much better growth.
Here they are July 31, 2013
Oct 10, Little growth, should have been exponentially bigger.
Root ball uncovered a bit.
Pair of quick snaps
Big dent in pup's corm
Oct 18, Under lights (Front Left)
Apr 4, 2014 - Massive growth now that it has its own space (Front Right)
